/*
 * 递归法计算游戏人员的年龄（4分）
 */

#include <stdio.h>

unsigned int ComputeAge(unsigned int n) {
	if (n == 1) {
		return 10;
	} else {
		return ComputeAge(n - 1) + 2;
	}
}

int main() {
	setbuf(stdout, NULL);

	unsigned int n;

	scanf("%u", &n);

	printf("The person's age is %u\n", ComputeAge(n));

	return 0;
}